Hey guys, I wana do a service on my wagon. In the manual it says use SAE 75W–85W conforming to API classification GL-3. and was wondering if i used 75w-85 GL-4 would be ok?

Hey guys, I wana do a service on my wagon. In the manual it says use SAE 75W–85W conforming to API classification GL-3. and was wondering if i used 75w-85 GL-4 would be ok?

Yes it will.

http://en.wikipedia.org/wiki/Gear_oil

API GL-1, oils for light conditions. They consist of base oils without additives. Sometimes they contain small amounts of antioxidizing additives, corrosion inhibitors, depresants and antifoam additives. API GL-1 oils are designed for spiral-bevel, worm gears and manual transmissions without synchronizers in trucks and farming machines.
API GL-2, oils for moderate conditions. They contain antiwear additives and are designed for worm gears. Recommended for proper lubrication of tractor and farming machine transmissions.
API GL-3, oils for moderate conditions. Contain up to 2.7% antiwear additives. Designed for lubricating bevel and other gears of truck transmissions. Not recommended for hypoid gears.
API GL-4, oils for various conditions - light to heavy. They contain up to 4.0% effective antiscuffing additives. Designed for bevel and hypoid gears which have small displacement of axes, the gearboxes of trucks, and axle units. Recommended for non-synchronized gearboxes of US trucks, tractors and buses and for main and other gears of all vehicles. These oils are basic for synchronized gearboxes, especially in Europe.
API GL-5, oils for severe conditions. They contain up to 6.5% effective antiscuffing additives. The general application of oils in this class are for hypoid gears having significant displacement of axes. They are recommended as universal oils to all other units of mechanical transmission (except gearboxes). Oils in this class, which have special approval of vehicle manufacturers, can be used in synchronized manual gearboxes only. API GL-5 oils can be used in limited slip differentials if they correspond to the requirements of specification MIL-L-2105D or ZF TE-ML-05. In this case the designation of class will be another, for example API GL-5+ or API GL-5 LS.
API GL-6, oils for very heavy conditions (high speeds of sliding and significant shock loadings). They contain up to 10% high performance antiscuffing additives. They are designed for hypoid gears with significant displacement of axes. Class API GL-6 is not applied any more as it is considered that class API GL-5 well enough meets the most severe requirements.

I've had some hassles ever since I changed my gearbox oil, Penwrite 75-90W and also an LSA 75W-85W spec have caused my dreamas with hard shifts, etc. Wish I never changed it in the first place.


I have settled onto a slightly thinner, fully synthetic oil from LSA and is working much better on my mechanics advice that the gears in this box are very big and it gets a fair bit of fluid drag on the gears making it hard for them to spin up and down with the synchros and thus reducing shift quality. Is alot better now but not perfect and I worry the thinner oil will wear things like synchros harder over time. Have been told by many people in the past they are fussy when cold for this reason (oil is thicker when colder)

Be curious to know how you go with what oil.

I would seriously suggest, if you are fussy with oils, and like good shift feeling, to use Redline MT90. It is, by far, the best gearbox oil I've ever used. It is well suited to the Magna 5 speed gearbox.

Castrol makes an oil specifically for Mitsu gearboxes, VMX 80. Check it out on the internet as well as other brands.

http://www.stealth316.com/misc/castrol_vm_80_gl4.pdf

"SAE 80W viscosity - SAE 75W/80 extrapolated. (Equivalent to SAE 10W/30) API GL4 performance level."

Worked really well in the Sigmas, and Magna 2.6L 5 speed gearbox, big improvement. A very thin oil, great cold shifting.

From memory I think the VMX80 or something similar was the factory fill.

From memory I think the VMX80 or something similar was the factory fill.

Yes, the VMX80 was the factory fill, and it is also what is used in Mitsubishi service centers, i replaced mine very recently when i had to do my clutch, no complaints.

Yes, the VMX80 was the factory fill, and it is also what is used in Mitsubishi service centers, i replaced mine very recently when i had to do my clutch, no complaints.

cool ill look into both of these :)

VMX80 was the original factory fill? I didn't know that, excellent! Made my notchy Sigma gearbox act like it had new synchros in it, when I changed to it. It was good in the 2.6 5 speed too, just a bit heavy shifting into 2nd when cold. Never a missed or crunched shift though. Not bad at 220,000 km.

At least we aren't stuck with a Borg-Warner box that needed ATF in it to make it shift nicely like some of the early Sigmas had in them. lol